Police investigating shooting threat at Pa. school

EBENSBURG, Pa.—Police have been increasing security and trying to find out who's behind a threatened shooting at a western Pennsylvania high school.

The threat was found written on a rest room wall at Central Cambria High School, near Ebensburg, on Tuesday. While police and school officials haven't released specific details, the threat warns of a shooting on May 3, the day before the school's prom.

Authorities are trying to use surveillance video to determine who may have left the threat so its credibility can be assessed and criminal charges can be brought.

In the meantime, area police are beefing up security in and around the school.

Parents were notified of the threat in a letter sent home with students on Wednesday.